The XB5AA21 is a single-pole single-throw (SPST) Pushbutton Switch with plastic bezel and fixing collar. This pushbutton switch features black flush unmarked spring return operator, 1NO slow-break standard silver alloy (Ag/Ni) contacts, round signaling unit head and screw clamp terminals. This XB5 series switch is suitable for use with the Harmony XB5 range products. It meets the EN/IEC 60947-1, EN/IEC 60947-5-1, EN/IEC 60947-5-4, JIS C 4520, UL 508 and CSA C22.2 No 14 standards.